Effects of photo-neutralization on the emission properties of quantum dots
Tobias Huber, Ana Predojevi\'c, Glenn S. Solomon, Gregor, Weihs
TL;DR
This study explores how photo-neutralization affects the emission and coherence of quantum dots, demonstrating increased brightness without compromising coherence properties under two-photon resonant excitation.
Contribution
It introduces the use of photo-neutralization to enhance quantum dot brightness while maintaining coherence, a novel approach in quantum dot excitation techniques.
Findings
Brightness increased by a factor of 1.5
Coherence times remain unaffected
Enhancement specific to biexciton-exciton pairs
Abstract
In this paper we investigate the coherence properties of a quantum dot under two-photon resonant excitation in combination with an additional photo-neutralization laser. The photo-neutralization increases the efficiency of the excitation process and thus, the brightness of the source, by a factor of approximately 1.5 for biexciton-exciton pairs. This enhancement does not degrade the relevant coherences in the system; neither the single photon coherence time, nor the coherence of the excitation process.
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